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Storing batteries in foam case: thermal overload during discharge?

Northern Bob

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Feb 8, 2019
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Let me describe a hypothetical case and then ask my question.

I have returned from a flying mission and recharge my three batteries in hopes of flying the next day. Perhaps a large weather front moves in faster than expected and prevents flying. For whatever reason the batteries remain in my case for 10-12 days before use.
At the 7-10 day mark I understand that these Intelligent batteries will auto discharge to 60% (?).

My question is this: as the batteries are surrounded by dense foam, a great insulator, would there be significant heat trapped by the foam to be detrimental to those batteries during discharge? If you have any knowledge/first hand experience about this I’d love to hear from you.
NB
 

Andre Levite

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Jun 18, 2018
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Treasure Coast of Florida
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how-to-spark.com
Let me describe a hypothetical case and then ask my question.

I have returned from a flying mission and recharge my three batteries in hopes of flying the next day. Perhaps a large weather front moves in faster than expected and prevents flying. For whatever reason the batteries remain in my case for 10-12 days before use.
At the 7-10 day mark I understand that these Intelligent batteries will auto discharge to 60% (?).

My question is this: as the batteries are surrounded by dense foam, a great insulator, would there be significant heat trapped by the foam to be detrimental to those batteries during discharge? If you have any knowledge/first hand experience about this I’d love to hear from you.
NB
The discharge rate of intelligent batteries is extremely slow - it occurs over several days. In my experience any trace amount of heat seems to dissipate as quickly as it is formed. This is despite that foam is a poor conductor of heat and there is zero air circulation.

Occasionally I must store my batteries right after charging due to foul weather. But the case is in an air conditioned room at 78F -- batteries get much much hotter during use or when case is out in sunlight.

Crazy question tho... If you are so concerned the batteries will overheat during medium term storage in the foam case --- why don't you put them on the shelf instead?!?
 
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Northern Bob

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Feb 8, 2019
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Ok. Thanks for responding. It’s just something I began wondering and had to satisfy my curiosity. Your response confirms my expectations on battery design. Thanks again.
NB
 

Jjmik

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Jan 16, 2019
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46
You will probably be fine..but

Since learning how flammable lipos are when I studied for part 107 I bought fire proof bags and keep all my phantom in one Mavic in another And spark and other small drones in a third. I also purchased individual fire resistant sleeves for each battery to keep them from getting all scratched up . Figured this was the safest since I keep mine in cool dry basement out of sight. I’m ready to travel. Next time we fly the batteries are ready to be carried on. I usually keep them around 30% stored.

I only keep mine in drone case but still out of drone When I am flying that day.

If you poke a hole in a lipo (harder to do with the plastic case around ours)it releases toxic fumes and starts on fire... difficult to put out and will do damage to surroundings quickly.
 

jimlips

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Feb 12, 2019
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West Sacramento, CA
You will probably be fine..but

Since learning how flammable lipos are when I studied for part 107 I bought fire proof bags and keep all my phantom in one Mavic in another And spark and other small drones in a third. I also purchased individual fire resistant sleeves for each battery to keep them from getting all scratched up . Figured this was the safest since I keep mine in cool dry basement out of sight. I’m ready to travel. Next time we fly the batteries are ready to be carried on. I usually keep them around 30% stored.

I only keep mine in drone case but still out of drone When I am flying that day.

If you poke a hole in a lipo (harder to do with the plastic case around ours)it releases toxic fumes and starts on fire... difficult to put out and will do damage to surroundings quickly.
...and is virtually impossible to put out the fire.
 

Jjmik

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Jan 16, 2019
Messages
56
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46
Scary how many batteries I have in my house and people taking them in planes...
 

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